correlation This year, nail polish sales jumped 59% from 2010. Despite economic troubles, it appears that painted nails are one expense that’s worth the plunge. “Beauty is one thing women never forget about,” said Demitrius Simpkins, a manager at a New York salon.
causation Such a growth in sales is probably because more buyers are interested in painting their own nails instead of paying for salon visits. ”Some women who used to come every Monday now come maybe every other Monday,” Simpkins claimed. source
The Lipstick Index has been a discussion for a long time and the causality of makeup sales going up is not as simple as replacing manicures. Some suggest that in difficult job markets people spend more on grooming to look their best for interviews.
Part of it might also be attributed to how unconventional colors (i.e. not the pinks, reds, beiges) are now accepted by the mainstream, and that the manufacturers have been doing an outstanding job of introducing captivating new colors recently.